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LTC1435 Datasheet(PDF) 3 Page - Linear Technology |
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LTC1435 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 20 page  3 LTC1435 ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating temperature range. LTC1435CG/LTC1435CS: 0 °C ≤ TA ≤ 70°C LTC1435IG/LTC1435IS: – 40 °C ≤ TA ≤ 85°C Note 1: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: LTC1435CG/LTC1435IG: TJ = TA + (PD)(130°C/W) LTC1435CS/LTC1435IS: TJ = TA + (PD)(110°C/W) Note 2: The LTC1435 is tested in a feedback loop which servos VOSENSE to the balance point for the error amplifier (VITH = 1.19V). Note 3: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. See Applications Information. Note 4: Oscillator frequency is tested by measuring the COSC charge and discharge currents and applying the formula: fOSC (kHz) = + –1 8.4(108) COSC (pF) + 11 () 1 ICHG ()1 IDIS TA = 25°C, VIN = 15V, VRUN/SS = 5V unless otherwise noted. TYPICAL PERFORMANCE CHARACTERISTICS INPUT VOLTAGE (V) 0 70 75 80 85 90 100 5 10 15 20 1435 G01 25 30 95 ILOAD = 1A ILOAD = 100mA VOUT = 3.3V Efficiency vs Input Voltage VOUT = 3.3V VIN – VOUT Dropout Voltage vs Load Current LOAD CURRENT (A) 0 0 0.2 0.1 0.3 0.4 0.5 0.5 1.0 1.5 2.0 1435 G04 2.5 3.0 RSENSE = 0.033Ω VOUT DROP OF 5% LOAD CURRENT (A) 0.001 50 55 65 70 75 100 85 0.01 0.1 1 1435 G03 60 90 95 80 10 CONTINUOUS MODE VIN = 10V VOUT = 5V RSENSE = 0.033Ω Burst Mode OPERATION Efficiency vs Load Current VITH Pin Voltage vs Output Current OUTPUT CURRENT (%) 0 1.0 2.0 3.0 0.5 1.5 2.5 20 40 60 80 1435 G06 100 10 030 50 70 90 Burst Mode OPERATION CONTINUOUS MODE INPUT VOLTAGE (V) 0 70 75 80 85 90 100 5 10 15 20 1435 G02 25 30 95 ILOAD = 1A ILOAD = 100mA VOUT = 5V Efficiency vs Input Voltage VOUT = 5V Load Regulation LOAD CURRENT (A) 0 0 0.5 1.0 1.5 2.0 1435 G05 2.5 3.0 – 0.25 – 0.50 – 0.75 –1.00 –1.25 –1.50 RSENSE = 0.033Ω |
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